BRS RODI units

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JFrar

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So i see pretty much 100% positive feedback on all of these...

so i live in Melbourne florida where our tap water quality meets the minimum standards, our water source comes from a standing and shallow big lake and is locally known for this. Anyway i see the 4stage and 6stage units.... $100+ in difference...

any feedback ??? im hoping to purchase one or the other pretty soon, and $300 is manageable .. but if i can save the money i would like to.

a good note would be that im trying to produce 15-20 gallons a week... maybe at times 30-40 gallons if i eventually convince some friends to start salt water. but for the most part 15-20 gallons
 
Deltec
I use 4 stage, but it has the capability of upgrading. This was mostly for financial reasons. I would do 6 over the 4
 
www.dinkinsaquaticgardens.com
Take a look at Spectrapure, you get much more for your money and they are about the oldest and most trusted name in the business. BRS is average when it comes to RO and RO/DI but I love their chemical supplements.
 
Awesome, will do.. Probably going with 6 stage whatever the case
 
You don't need six stage, 4 is fine. As long as you buy a good sediment and carbon filters and change them every 6 months are so you don't need the extra filters. Going with 2 DI filters is a personal preference. Take a look at this one from spectrapure, it will meet your needs. It should get you 5 gallons every hour or so.

http://spectrapure.com/Refurbished-90-GPD-RODI-System
 
Cool. Thank you for input, that price would be nice cause then I can buy a better go pro camera :) lol
 
More stages is not better, fewer, higher quality low micron stages is what you want. When you start adding things in front of the membrane you reduce the pressure available to the membrane which lowers its rejection rate or removal efficiency so water quality can actually go down and you drive the initial and replacement costs up. "Stages" is a word the ebay vendors love, they tack a bunch of low quality filters on and magically its "7 stages" like its the best thing since sliced bread when in fact it is a cheap drinking water system with a bunch of low quality high micron sediment filters about as efficient as a screen door, GAC or high micron carbons or little hollow tubes with some outdated dry resin bobbing around in them they try to convince you is efficient.
Reputable vendors with a proven history have learned a single low micron, absolute or near absolute rated sediment filter, a single low micron extruded carbon block, a good name brand RO membrane such as Dow Filmtec (Spectrapure membranes start out as Dow Filmtec but are specially treated to improve their efficiency then either batch tested or individually hand tested) or GE Water and a single vertical DI with high quality fresh mixed bed DI resin is all you need in 99.99% of all cases. I do use and recommend dual DI, it is not a matter of personal preference but is a proven value. You can do without it but it is nice to have and it will save you money in the long run. Nice thing about dual DI is it is very easy to add in the future. The Spectrapure refurbished system is an excellent value and a good place to start. Add a good handheld TDS meter like the HM Digital TDS-3, TDS-4TM or AP-1 and you are in good shape.
 
Last edited:
AS
How does dual DI save you money? I guess I haven't seen that explained before.
 
When you have two identical DI cartridges you monitor the TDS from each one separately, when the first one starts to exhaust you remove it, place the second cartridge in the first position and add the new refilled cartridge to the second position. This both extends the life of the DI and gives you better quality water.
The other method is the Spectrapure MaxCap and SilicaBuster configuration. The MaxCap acts as a roughing filter or preDI and makes the downstream SilicaBuste rDI las tat least 3 times longer. You replace 3 MaxCaps before ever needing to replace the SilicaBuster once. I get over 1000 gallons from each MaxCap and 3000+ gallons out of a SilicaBuster. I bought their Super versions of both recently and am still waiting to see TDS in the finishe water to install them but the darn things just keep going and going.
 
That doesn't make sense to me. If you have a 1 cartridge or 2 cartridge system, the first cartridge is going to go out at the same time on each one. The first cartridge gets refilled in both scenarios. In the 1 cartridge system you now have fresh DI, in the 2 cartridge system it now has a cartridge with used DI and probably won't last as long. I agree that the water is probably cleaner but I don't see where money is saved, especially if you throw in the extra work that is required to monitor the 2 cartridges.
 
I have a used three stage 75GPD unit with new cartridges (about half used or so) I made about 400 gallons in total in the two years I had, 300 of which was used in a week with my new tank.
 
Money is saved because u can run the first cartridge to exhaustion meaning u can run that first cartridge at 1-3 tds output for a while longer because of the second cartridge and they don't go out at the same time cause in a sense 1 will do the work so it will be filtered before it even reaches the second. As far as how many stages with brs single sedement there dual stage carbon blocks are worth the investment dual di stages are a matter of opinion and dual membranes depends on how long u want to wait for water a single membrane takes longer then u think 75 gl a day is literly only about 3 gallons n hour are u willing to wait that long. As far as value Def skip that the tds meter and pressure gauge are essential as far as I'm concerned. Plus the flush kit is reported to extend membrane life.
 
Deltec
I usually run mine until it hits about 8 or 10 before I change the di. I doubt I would see the benefit. Plus I'm too lazy to do all that checking.

I can see the benefit now but it just wouldn't work for me.
 
This all seems so foreign to me, haha. But I'll figure it out, I'm going to order a unit next weekend
 
You don't want to run a DI cartridge once it shows signs of exhaustion. There are many weakly ionized substances that do not register well on a TDS meter such as phosphates, silicates and nitrates that are released even before TDS is seen so you want to change the cartridge or resin as soon as you see anything other than zero.
 
AS
That's true but that's where we are saying the benefit of a dual di cartridge. With a single I'd say ur right because of the finished product ur producing but with a dual u can use that same cartridge longer and run it to a tds reading above 0 because of the second stage that Is essentially finishing the filtration. U need a 3 stage tds meter for this one before first stage and after first then after second to ensure u are ending the last stage with 0 and to see when to replace the 1st stage and when u replace it u move the 2nd to first and the fresh di will be second and so on and so forth. So dual di not required but will extend the life of each individual cartridge.
 
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